PACCAR PX-8 CM2150 (2007-09) Fault Code: 249 PID: 171 SPN: 171 FMI: 3 Ambient Air Temperature Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at ambient air temperature circuit.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

The ambient air temperature sensor shares return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Check active fault codes with multiple counts first.

Possible causes:

1)Open return circuit in the harness, connectors, or sensor
2)Open signal circuit or shorted to voltage source.

Possible repairs:

1)Replace the ambient air temperature sensor.
2)Replace the ECM.
3)Repair or replace the engine harness.

Related

Categories DTC TRUCKS, PACCAR, PX-8 CM2150 (2007-09) Tags -, 1, 171, 2007-09, 249, 3, Above, Air, Ambient, at, Circuit, Circuit., CM2150, Code, Detected, Fault, FMI, High, Normal, or, PACCAR, PID, PX-8, Sensor, Shorted, signal, Source., SPN, Temperature, to, Voltage

DOWNLOAD Paccar ESA Electronic Service Analyst 5.5.0 Diagnostic Software 2023
PACCAR $96.00
Rated 0 out of 5
VOLVO PTT TECH TOOL 2.8.220 2023 Last version 1pc
Trucks software $200.00
Rated 0 out of 5
Navistar international OnCommand service information 2018 software trucks
Navistar $50.00
Rated 0 out of 5
Eaton Service Ranger 4 4.2 database 2017
Eaton $50.00
Rated 0 out of 5
Volvo Impact 2021 Trucks & Buses 06.2021 DVD 9116 Spare Parts Catalog
Trucks software $55.00
Rated 0 out of 5

Diagnostic Software for Navistar Diamond Logic Builder 2023 (DLB)
Navistar $94.00
Rated 0 out of 5
Cat Factory Password Generator 1.0 2019 WINDOWS 10
CAT $55.00
Rated 0 out of 5
Allison DOC 2019 PC software + GEN5 2019 truck
Allison $40.00
Rated 0 out of 5
Diamond Logic Builder DLB 2019 Database 2019
Navistar $50.00
Rated 0 out of 5
JOHN DEERE PARTS ADVISOR & HITACHI 2.24.2 [2023.07] EPC
Hitachi $125.00
Rated 0 out of 5
Allison Doc Premium Update 2023 v2
Allison $102.00
Rated 0 out of 5
Hino DX3 1.22.10 2022 ( 1 PC )
Hino $96.00
Rated 0 out of 5
Diamond Logic Builder DLB 2018
Navistar $40.00
Rated 0 out of 5
volvo Devtool Studio V2 / V3 / V4 Developer tool plus 2.6 / 2.7
Trucks software $35.00
Rated 0 out of 5
VOLVO PROSIS 2023 ( 11.2022 )
Trucks software $96.00
Rated 0 out of 5
Volvo PROSIS Offline 2019 Parts Catalog Installation Service
Trucks software $45.00
Rated 0 out of 5
Isuzu E-IDSS Diagnostic Service System 04.2022 ( 1 PC )
ISUZU $126.00
Rated 0 out of 5
Cumminmms Insiter 8.9 Diagnostic Software
cummisznn $95.00
Rated 0 out of 5
CATERPILLAR FLASH FILE 2021 74 GB ( Collection 2021 ) sofware trucks
CAT $55.00
Rated 0 out of 5
Wabco PIN Code Calculator Diagnostic Software PIN 1 PIN 2
Trucks software $10.00
Rated 0 out of 5

SERVICE MANUAL Fuso FE & FG Series 2008-2010
FUSO
Rated 0 out of 5
SERVICE MANUAL International Engines MaxxForce DT 9 10 (2010-2013)
INTERNATIONAL ENGINES $20.00
Rated 0 out of 5
SERVICE MANUALDAF FUSO CANTER 2012-2016
FUSO $23.00
Rated 0 out of 5
SERVICE MANUAL BOBCAT 853 sms
BOBCAT $40.00
Rated 0 out of 5
SERVICE MANUAL BOBCAT 5600 SMS
BOBCAT $62.00
Rated 0 out of 5
SERVICE MANUAL DETROIT 1995 SER 60 PARTS
DETROIT $65.00
Rated 0 out of 5
SERVICE MANUAL MACK V-MAC II
MACK $28.00
Rated 0 out of 5
SERVICE MANUAL International Engines MaxxForce 7 (2010 & Newer)
INTERNATIONAL ENGINES $34.00
Rated 0 out of 5
SERVICE MANUAL BOBCAT 7753 sms
BOBCAT $37.00
Rated 0 out of 5
SERVICE MANUAL BOBCAT 753 sms
BOBCAT $57.00
Rated 0 out of 5